I found a thread on the Debian User Forums detailing a similar problem with a new Intel ethernet controller (though the controller itself is different than mine). The suggestions there are to try the testing installers or to use a kernel from backports.

At the moment I can't try either because I had to return the machine due to a (presumably unrelated) fan problem, but for now I'll assume those are potentially valid solutions.

I'll update this answer when I am able to verify.

I found a thread on the Debian User Forums detailing a similar problem with a new Intel ethernet controller (though the controller itself is different than mine). The suggestions there are to try the testing installers or to use a kernel from backports.

EDIT: I tried one of the weekly builds of Debian testing and Ethernet is now working in the installer.